APT Research Private Limited Data Analytics Interview Questions, Process, and Tips

Round duration - 90 Minutes
Round difficulty - Medium

The round was of 90 minutes.
The first section had 3 coding questions. (leetcode mediums)
The second section had problems based on probability and linear algebra and general mathematics.
The third section had MCQs based on some puzzles and cs fundamentals.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
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Q2. 
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
• 0 - representing an empty cell
• 1 - representing a fre...read more
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Q3. 
Longest Common Prefix Problem Statement
You are given an array ‘ARR’ consisting of ‘N’ strings. Your task is to find the longest common prefix among all these strings. If there is no common prefix, you ha...read more
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Round duration - 45 Minutes
Round difficulty - Easy

This round started with a brief discussion about my projects and previous internship(about 15 mins).
Then it was followed by 2 coding questions(10-12 mins for the first question and 15 mins for the second question).
The interviewer asked me if I had any questions. I asked 2-3 questions about the projects we will be working on the what exactly the company does.

Q1. 
K-th Largest Number in a BST
Given a binary search tree (BST) consisting of integers and containing 'N' nodes, your task is to find and return the K-th largest element in this BST.
If there is no K-th la...read more
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Q2. 
Peak Element Finder
For a given array of integers arr, identify the peak element. A peak element is an element that is greater than its neighboring elements. Specifically, if arr[i] is the peak, then both...read more
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Round duration - 70 Minutes
Round difficulty - Easy

It was a mix of HR+technical round. A senior person from the company took my interview. He first asked me about my interests and why I want to join this company and about my future goals. He then asked my favourite topic, and I said graphs. Then we had a good discussion on graphs and the different concepts and popular algorithms. Then he asked 2 coding questions, one related to graphs and one related to backtracking.
After this, we had a brief discussion of some of my ML projects.

Q1. 
Evaluate Division Problem Statement
Given an array of pairs of strings equations representing a fraction and an array of real numbers values. Each element in equations denotes a fraction with the first st...read more
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Q2. 
Lexicographically Smallest Array Problem Statement
You are given an array ARR of 'N' integers and a positive integer 'K'.
Your task is to determine the lexicographically smallest array that can be obtain...read more
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